N-(tert-butoxycarbonyl)-2-(tert-butyldimethylsiloxy)-3-methyl-pyrrole (4) to several α-methylene lactones catalyzed by fluoride ions yielded the corresponding homologated products (26–30) with good yields. Application of this reaction to the sililoxy bicyclic lactone (5) allowed us to isolate the tricyclic lactone (26), a highly valuable intermediate in our synthetic strategy leading to the growth
的迈克尔加成ñ - (叔丁
氧羰基)-2-(叔
甲基甲
硅烷氧基)-
3-甲基吡咯(4)由
氟离子催化的几个α亚
甲基内酯得到相应的同系化的产品(26 - 30)具有良好的产量。该反应在甲
硅烷氧基双环内
酯(5)上的应用使我们能够分离出
三环内
酯(26),这是我们合成策略中非常有价值的
中间体,可导致生长调节剂(+)-二
氢氨苄
青霉素(1)。